Topics: The Skeletal System Quiz
Which of the following is a hard substance that keeps bones from rubbing together?
A. Joint
B. Tendon
C. Ligament
D. Cartilage
Select your answer:

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The Circulatory System › ViewIt lets blood be pumped from the heart to the rest of the body.
A. Aortic valve
B. Bicuspid valve
C. Tricuspid valve
D. Pulmonary valve
Anatomy › View
The minimum amount of stimulus required for a muscle contraction to occur is the
A. Smooth muscle
B. Threshold stimulus
C. Stay relaxed
D. Acetylcholine